SDR 2002UALA00726

Service difficulty report · Compressor · Boeing 747422

Difficulty date: February 21, 2002
Submitted: May 8, 2002
Operation: Air carrier
Aircraft: N107UA
Make and model: Boeing 747422
Aircraft serial: 26900
Aircraft time: 15,666 hours, 1,902 cycles
Engine: Pwa PW4056
Engine time: 19,360 hours, 2,424 cycles
System (JASC): 7230 · Turbine Engine Compressor Section
Part: Compressor
Part serial: B27668
Condition: Faulty
Location: Nr 3 Engine
Part time: 19,360 hours, 2,424 cycles
Stage of operation: CL
How discovered: O
Nature of condition: E, A, Y
Precautionary procedure: J, A

As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.

What was found

NR 3 ENGINE SURGED 3 TIMES DURING TAKEOFF WITH FLAMES PER CREW. CREW WRITE UP DURING T/O LAX NR 3 ENGINE VIBRATED WITH LOUD 3 TIME POPS. ENGINE EXPERIENCED A GROUP 3 SURGE (EXCESSIVE BLADE TIP CLEARANCES IN HPC REAR STAGES). ENGINE WAS REMOVED FOR COMPRESSOR REFURBISHMENT.